chore: add package support metadata

[Shreshth3]

Summary

• add npm homepage metadata for docusaurus-theme-search-typesense
• add npm bugs.url metadata pointing to the GitHub issue tracker

Verification

• node -e "const p=require('./package.json'); if(p.name!=='docusaurus-theme-search-typesense'||p.homepage!=='https://github.com/typesense/docusaurus-theme-search-typesense#readme'||p.bugs?.url!=='https://github.com/typesense/docusaurus-theme-search-typesense/issues') process.exit(1); console.log('package metadata OK')"
• npm pack --dry-run --ignore-scripts --json
• git diff --check